package com.ncut.service.impl;

import com.ncut.dto.GoodsSalesDTO;
import com.ncut.entity.Orders;
import com.ncut.mapper.OrderMapper;
import com.ncut.mapper.UserMapper;
import com.ncut.service.ReportService;
import com.ncut.service.WorkSpaceService;
import com.ncut.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * @FileName ReportServiceImpl
 * @Description
 * @Author Sword
 * @date 2025-07-27
 **/

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private WorkSpaceService workSpaceService;

    /**
     * 营业额统计
     *
     * @param begin
     * @param end
     * @return
     */
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放begain到end范围内的每天的日期
        List<LocalDate> dateList = getDateList(begin, end);

        //存放每天的营业额
        ArrayList<Double> turnoverList = new ArrayList<>();

        //查询date日期对应的营业额
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);

            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }

        //封装返回结果
        return TurnoverReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();
    }

    /**
     * 用户统计接口
     *
     * @param begin
     * @param end
     * @return
     */
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        //存放从begin到end之间的每天对应的日期
        List<LocalDate> dateList = getDateList(begin, end);

        //存放每天新增用户数量
        List<Integer> newUserList = new ArrayList<>();

        //存放每天的总用户数量
        List<Integer> totalUserList = new ArrayList<>();

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap();
            map.put("end", endTime);

            //每日总用户数量
            Integer totalUser = userMapper.countByMap(map);

            map.put("begin", beginTime);
            //每日新增用户数量
            Integer newUser = userMapper.countByMap(map);

            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }

        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .build();
    }

    /**
     * 订单统计
     *
     * @param begin
     * @param end
     * @return
     */
    @Override
    public OrderReportVO getOrdersStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = getDateList(begin, end);

        //存放订单总数
        List<Integer> orderCountList = new ArrayList<>();

        //存放有效订单数
        List<Integer> validOrderCountList = new ArrayList<>();

        //遍历dateList集合，查询每天的有效订单和订单总数
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            //查询每天的订单总数
            Integer orderCount = getOrderCount(beginTime, endTime, null);

            //查询每天的有效订单数
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);

            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }


        //计算时间区间内的订单总数量
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();

        //计算时间区间内的有效订单数量
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();

        //计算订单完成率
        Double orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount == 0.0 ? 0.0 : validOrderCount.doubleValue() / totalOrderCount;

        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 查询销量排名top10
     *
     * @param begin
     * @param end
     * @return
     */
    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);


        List<GoodsSalesDTO> goodsSalesDTOList = orderMapper.getSalesTop10(beginTime, endTime);

        List<String> nameList = goodsSalesDTOList.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        List<Integer> numberList = goodsSalesDTOList.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());

        return SalesTop10ReportVO.builder()
                .nameList(StringUtils.join(nameList, ","))
                .numberList(StringUtils.join(numberList, ","))
                .build();
    }

    /**
     * 导出营业数据
     *
     * @param response
     */
    @Override
    public void exportBusinessData(HttpServletResponse response) {
        //1.查询数据库，获取营业数据————查询最近30天的运营数据
        LocalDate begin = LocalDate.now().minusDays(30);
        LocalDate end = LocalDate.now().minusDays(1);

        //查询概览数据
        BusinessDataVO businessData = workSpaceService.getBusinessData(LocalDateTime.of(begin, LocalTime.MIN), LocalDateTime.of(end, LocalTime.MAX));

        //2.通过POI将数据写入到Excel中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
        try {
            //基于模板创建一个Excel表格对象
            XSSFWorkbook excel = new XSSFWorkbook(in);

            //填充数据--时间
            XSSFSheet sheet = excel.getSheet("Sheet1");
            sheet.getRow(1).getCell(1).setCellValue("时间：" + begin + "至" + end);

            //获取第四行
            XSSFRow row = sheet.getRow(3);

            //营业额
            row.getCell(2).setCellValue(businessData.getTurnover());
            //订单完成率
            row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
            //新增用户数
            row.getCell(6).setCellValue(businessData.getNewUsers());

            //获取第五行
            row = sheet.getRow(4);

            //有效订单数
            row.getCell(2).setCellValue(businessData.getValidOrderCount());
            //平均客单价
            row.getCell(4).setCellValue(businessData.getUnitPrice());

            //填充明细数据
            for (int i = 0; i < 30; i++) {
                LocalDate date = begin.plusDays(i);
                //查询某一天的营业数据
                BusinessDataVO businessDataVO = workSpaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

                //获取某一行
                row = sheet.getRow(i + 7);
                //日期
                row.getCell(1).setCellValue(date.toString());
                //营业额
                row.getCell(2).setCellValue(businessDataVO.getTurnover());
                //有效订单数
                row.getCell(3).setCellValue(businessDataVO.getValidOrderCount());
                //订单完成数
                row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
                //平均客单价
                row.getCell(5).setCellValue(businessDataVO.getUnitPrice());
                //新用户数
                row.getCell(6).setCellValue(businessDataVO.getNewUsers());
            }

            //3.通过输出流将Excel文件下载到客户端
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            //关闭资源
            out.close();
            excel.close();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }


    }

    /**
     * 统计订单数量
     *
     * @param beginTime
     * @param endTime
     * @param status
     * @return
     */
    private Integer getOrderCount(LocalDateTime beginTime, LocalDateTime endTime, Integer status) {
        Map map = new HashMap();
        map.put("begin", beginTime);
        map.put("end", endTime);
        map.put("status", status);

        return orderMapper.countByMap(map);
    }

    /**
     * 获取日期列表
     *
     * @param begin
     * @param end
     * @return
     */
    private static List<LocalDate> getDateList(LocalDate begin, LocalDate end) {
        //存放从begin到end之间的每天对应的日期
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);

        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        return dateList;
    }
}
